I open the program and start uploading a video but it soon says “sansa media converter.exe has stopped working.” It worked for about two days, and it let me convert videos (mp4’s). Now every time I try to upload a video on my Sansa, it will only work for about 30 seconds and then it will say “sansa media converter.exe has stopped working” and all I can do is close the program. Help!!
Try uninstalling and reinstalling it if you still have the installer.
Or just forget about it and get http://code.google.com/p/video4fuze/
There isn’t by chance a video4view program out there is there? SMC is giving me the same error. I’m wondering if it is due to the size of the videos. Uninstalling and reinstalling SMC doesn’t fix the problem.
All I did with my problem is reinstall. It works with me. hope this works for you. 
Thanks Sansa Guru, this solved my problem!
